Internal combustion engine



June 6, 1933. F. Gos'sLAu INTERNAL COMBUSTION ENGINE Filed Sept.- 29, 1931 ,e counter, behind the crank case.

means the air resistanceat the front surfaceA Patented June 6, 1933v PATENT OFFICE FRITZ GOSSLAU, OF BERLIN-CHARLOTTENBURG, GERMANY, ASSIGNOR TO SIEMENS HALSKE, AKTIENGESELLSCHAFT, 0F CORPORATION OF GERMANY SIEMENSSTADT NEAR BERLIN, GERMANY, A.

INTERNAL COMBUSTION ENGINE Application led September 29, 1931, Serial No. 565,806, and in Germany October 3, 1930.

My invention relates to internal combustion engines and more particularly to a water-cooled internal combustion engine of the radial type.

When internal combustion engines with radially arranged cylinders are used, the general trend is to keep the number of cylinders of the engine as low as possible. For this reason it has already been suggested to use fourcylinder internal combustion engines for airplanes and, in order to reduce as much as possible the Ifrontal surfaces of the engine, to place a part of the auxiliary apparatus, such as the fuel pump, the oil pump and the distributor for the compressed air, in front of, and another part, such as the scavenging blower and the drive for the revolution By this of the engine is lessened.

When using radial engines to drive other rotating machines, for example generators, the requirements dier from those existing when radial engines are used for airplanes. The advantages of the radial engine over the engine with cylinders side by side in-a row, hitherto used for driving rotating machines performing work, or vehicles, consistv in the first place in the possibility of fastening the combustion engine directly to the driven machine by means of flanges. With a lnachine with cylinders side by side an arrangement of that kind is practically impossible owing to the length of the engine. But even the radial engine is still rather long when the auxiliaries, fuel pumps, blower etc.` are located in front of and behind the plane of the radially set cylinders, as was hitherto customary with airplane engines. This causes an excessive stress on the ,flange connection and gives rise to destructive vibrations.

My invention avoids the above drawbacks by employing an engine of the radial type in which the auxiliary apparatus are located directly in the same plane as the radially arranged cylinders and are placed between the individual cylinders. lVith this construction the length of the engine can be reduced to such a degree as to hardly exceed that of the cylinder diameter. l

Q An example for carrying out my invention 1s illustrated in the accompanying drawing,

y in which:

Fig. 1 is a view in elevation of a four-cylinder engine of the two-stroke cycle type, and .Figa 2 is a sectional view of the same engine. Between the two upper cylinders 1 are placed the fuel pumps 5 and between the two lower cylinders 1 the scavenging blower 4. .These two auxiliaries are driven from the crank shaft 12 through a series of intermediate gear wheels 13, which also drive the oil pump 7 and the water pump 6. l

Hitherto it was customary in radial engines to convey the gas mixture or the air to the cylinders by means of an annular channel positioned in front of, or behind, the cylinder plane. Y

This arrangement however increases the overall length of the engine. In the present case, therefore. instead of an annular channel of the said kind, two receivers 8 in the shape l of two lobes are provided. These lobes have substantially the same thickness as the train of gear wheels 13, and are placed on either side of this train, so that the presence of these receivers does not increase the size of the motor in axial direction. These receivers are each connected with blower 4 and with the two cylinders to which they are adjacent. Such an ,arrangement -is a further means towards reducing the overall length according to my invention. Two radiators, indi. cated by 10, are also located each between two cylinders, so that the increase in length of the engine, usually zdue in part in engines of the conventional typeto the radiator, is avoided. As will be seen from Figs. 1 and 2, the whole engine with all the auxiliary apparatus is compactly mounted together in one plane and a minilnum overall length is obtained. l

Fig. 2 also shows that the connection between the driving engine and the driven machine is exceedingly easy to make. The ra- .l I claim as my invention:

l. A Water-cooled internal combustion engine having radial cylinders arranged in one plane and having a casing directly attachable to a driven machine, said engine having its larger auxiliaries located in the same plane as the cylinders, to confine the entire engine -Within a disk substantially of the thickness of the cylinders.

2. A Water-cooled internal combustion e11- gine having radial cylinders arranged in one plane and having a casing directly attachable to a driven machine, said engine having fuel pulnps arranged between the upper cylinders, and a scavenging blower disposed between the lower c vlinders,all of said auxiliaries being located within the plane of the cylinders.

8. A water-cooled internal combustion engine having radial cylinders arranged in one plane and having a casing directly attach able to a driven machine7 -said engine having fuel pumps arranged between the upper cylinders and a scavenging blower arranged between the lower cylinders. all of said auxiliaries being located within the plane. of the cylinders, a train of intermediate gear wheels for driving said auxiliaries. and two receivers for the scavenging air, said receivers comprising two flat lobes disposed on either side of said gear train and connected with thel blower and the immediately adjacent cylinders.

In testimony whereof I afiix my signature.

FRITZ GOSSLAU. 

